Normally, frogs eat small invertebrates that easily fit into their mouths, but studies of stomach contents have shown that they sometimes eat eggs, tadpoles and even adults of other frogs. What are the conditions under which frogs eat frogs?
Invasions of alien species begin with the human-assisted movement of living individuals or propagules across biogeographic barriers. As a result, the contributions of specific pathways to introduction and subsequent invasion—and the changes in the importance of pathways over time—are receiving increasing attention from scientists and policymakers.
Prevention of the introduction of new invasive species to a country is considered to be an effective measure against biological invasions. The growth of online sellers, however, makes the regulation of plant introductions much more challenging - a new plant is only a few clicks away and can be bought very easily.
Information on how or why alien species arrive in a country can help prevent future introductions. Such information is usually stored in databases, and in many parts of the world, these databases are used for research and management.
Have you ever wondered why species are organised in such a way that species in one group interact more with each other, than with species in other groups?
